Malicious PDF — malware analysis report

Static analysis result for SHA-256 d5ecb2ca8fd4e0df…

MALICIOUS

PDF

51.5 KB Created: 2020-10-30 14:42:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: bc9342077ce307f345acc24defb0a351 SHA-1: d14a9dcc6e73bd84530db783d68c2041c0993d1e SHA-256: d5ecb2ca8fd4e0df3346f01bcb83daabf0177988de22de857987d3d9c56c10f1
154 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm and routes users through malicious redirector infrastructure. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://ttraff.cc/123?keyword=surah+yaseen+pdf+online In PDF document text
    • https://viweposedijul.weebly.com/uploads/1/3/1/0/131070314/1122492.pdfIn PDF document text
    • https://lapebezufidasaz.weebly.com/uploads/1/3/4/3/134316617/562751abda8e1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381094/normal_5f91b6e04245b.pdfIn PDF document text
    • https://bizalaso.weebly.com/uploads/1/3/4/4/134443832/komugidumaji-pagarowixobe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366014/normal_5f8b4335ef216.pdfIn PDF document text
    • https://biduvokiket.weebly.com/uploads/1/3/4/3/134367510/vimisik.pdfIn PDF document text
    • https://tovozilulu.weebly.com/uploads/1/3/0/8/130873983/3007040.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cdn.shopify.com/s/files/1/0501/5994/3832/files/calculus_formula_sheet_level_3.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0497/5935/5041/files/exploration_lite_craft_apk_uptodown.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/7222/3387/files/joe_girard.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0503/9859/3211/files/famous_urdu_novels_quotes.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/4279/8757/files/71958411986.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0505/1387/1018/files/ap_bio_photosynthesis_lab_hypothesis.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8ed805ce-af55-4ba9-a674-63c817cd1eff/99086945755.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/da637296-987e-431a-8bfe-2cd316f49876/enlever_mauvais_oeil_avec_oeuf.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0504/4672/9395/files/turbina_pelton_casera.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0492/8199/0812/files/conteo_de_reticulocitos.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off00009aee.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x9AEE 22008 bytes
SHA-256: 76882c99a073578ffe434f700c14c6a21a2b42956ceb6ff88f6ea5a342a0ca4b
font_00_sfnt_off000067a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x67A7 5332 bytes
SHA-256: a668206cbb192a666998b3dfb88da12f7606e1c809b14d7f91780a508501eba5
font_01_sfnt_off000079c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x79C8 9696 bytes
SHA-256: 152ca3ba42c2135efc566647df041f112b206b0e9fd94522c20278aa1f484366

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